package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 *  Version 3.0  升级   双向链接【客户端与服务器相互说话】
 *
 *
 */
public class Server {
    private ServerSocket serverSocket;
    public Server() {
        try {
            serverSocket=new ServerSocket(4545);
        } catch (BindException e){
            System.out.println("端口号重复申请，建议换个端口号");
        } catch (IOException e) {
            System.out.println("申请端口号失败....");
        }
    }

    public void start(){
        try {
            while(true) {
                    System.out.println("----等待客户端链接-----");
                    Socket socket = serverSocket.accept();
                    String ip = socket.getInetAddress().getHostAddress();
                    System.out.println(ip + "客户端链接成功了");


                     new Thread(new CS(socket)).start();
                }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {
            if(serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
            }
        }
    }

    public static void main(String[] args) {
        new Server().start();
    }

    private class CS implements Runnable{
        private Socket socket;
        private String ip;

        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }

        public void run() {
            PrintWriter pw=null;
          //  BufferedReader br=null;
            try {
           //1.读入定义
           BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
           //2.定义写出
           pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);

           //1.1 读入功能：存线程中
           new Thread(()->{
               try {
                   String message;
                   while((message=br.readLine())!=null){
                       System.out.println("客户端说："+message);
                       //增加写出一句话：读完卡住等待输入
                       System.out.println("服务器请输入：");
                   }
               } catch (IOException e) {
                   System.out.println("客户端读入失败！");
               }
           }).start();
           //2.1 提供写方法：控制台输入
            Scanner input =new Scanner(System.in);//控制台卡住
            while (true) {
                System.out.println("服务器请输入：");
                String say=input.nextLine();//得到控制台输入值
               //打印：服务器端说的文本---打印客户端
               pw.println("服务器说："+say);
            }
            } catch (NullPointerException e){
                System.out.println("IO流传入对象，" +
                        "有对象为null！立马核对，" +
                        "建议：查看try块中对象可能赋值为null");
            } catch (UnsupportedEncodingException e) {
                System.out.println("客户端或者服务器端：字符集不一致");
            } catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误！");
            } finally {
              /*  if(br!=null)
                    try {
                        br.close();
                    } catch (IOException e) {
                        System.out.println("结束通讯：关闭失败！");
                    }*/
                if(socket!=null&&!socket.isClosed())
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("通讯关闭失败~");
                    }
            }
        }
    }
}
